Feeding mechanism for sewing-machines.



. a. s. mam. FHEDIHG. MEGEAEISM. FOB SEWING MACHIHEB.

APPLICATION FILED MAR. 19. 1909- 1 2 Patented 001:.22, 1912 2 SHEETS-*SHBEI l.

I lNl/E/VTOR JOHN s. Fl/VCH,

' ATTORNEY J.- S; FINCH. FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MABHIQ, 1909.

Patented Oct. 22, 1912.

2 SHEETS-SHEET 2.

l0 4 9 5 .30 V WITNESSES 0/ Jolxvmi oljlcfi .4

ATTOR/VE V in connection with many of the commonlycitizen of the United States,

Bridgeport, in-

JOHN s. FINCH,

or BRIDGE-PORT, connnc'rrcu'r, Assmnon. 'ro 'rn'n SINGER. mmmacs rnnnvc COMPANY, A ooaroaerron or new JERSEY...

FEEDING. MECHANISM roe snwrne-mecnmns.

' Specification of Letters Patent. application filed March 19,

rateateao t. 22,1912.

j aos. senai'naeaeeoi.

To all whom it may concern:

Be it known that 1, JOHN S. FINCH, a residing at the county of Fairfield and State ofConnecticut, have invented certain new andv useful Improvements in Feeding Mechanism for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This inventlon relates to lmprovements .1n' sewing' machmes provided with feeding,

mechanism for effecting an elastic lockt stitch seam.- Ithas beenthe common practice toettect such seam by employing multiple feed-dogs, as in the device of the application, one of such feed-dogs acting upon the fabric in advance of and the other at the feed-dog located at the, rear of the needle being given greater amplitude of feed movement than the feedstretched at the point! dog arranged at the opposite side of said needle, thus causing the fabric to be slightly 7 0t stitch formation. In the operation of lock-stitch sewing machines employing an oscillating or rotating loop-taker, it is extremely important that there be an unobstructed space in front of I the loop-taker ,to permit the operator to conveniently engage and disengage the bobbin from its holder or case, which is not a consideration in connection with sewingmachines having loopers as distinguished from loop-takers. I

When using lock-stitchsewing machines the present invention is to simplify and mount the feed-dog-controlling elements so that attachments which require space below the sewing machine bed-plate may be conveniently accommodated.

Referring to the accompanying drawings,

' in the several figures of whichlike parts are similarly designated, Figure 1 is an underfrom the eccentric side view of the frame or bed-plate of a sewing machine equippedwith the improved mechanism. Fig. 2 is asectional-elev'ation on'the line a, 'b, 1. F ig. 3 is a front side sectional elevation, on the line 6, Fig. 2, of a port-ion of the arm standardand the overhanging arm. Fig. tie a view -in perspective of the feed-dog-carrying bars and the front end portions of the feed rock: shafts. Fig. 5 is a View, mainly in. section, on. the line C, D, Fig. 1, of the forward ends of the feed rock-shaftsshownin Fig. 4;

Fig. 6 is a vi'ew'in perspective of the complemental feed-dogs. r

In describing the-invention, only su reference will 'be made to the well-kno parts .of the sewing machine as is deem necessary for a proper understanding of invention.

1 representsthe frame or bed-plate-o the sewing machine, 2 the overhanging ar 3 the arm standard, 4 the band-wheel. main or needle-bar-driving shaft and looptamer-driving shaft carrying the beveled gear 7 win h meshes with a be eled gear (not shown) carriedby the loopshaft 8, the loop-taker and loop-taker in order that the manner-of mounting the feed-dogs might be more clearly illustrated.

jgear having been omitted from the dra --ings 9 represents the feed-lift eccentric secured upon the main shaft '5, and 10 the feed-lift eccentric connection. The upper 'end of 'said end being pivotallyattached to a crank-arm 11 carriedby a tubular feed-lift rock-shaft 1.2 which in turn is mounted to oscillate upon the loop-taker-actuating shaft 6, said tubular rock-shaft being'provided at its forward end with a second crank-arm .13 carrying a stud-screw 14 provided with slideblocks 15 and 16 which work in the respective slots 17 and 18 formed in the respective feed-dog-carrying bars 19 and 2.0, whereby the vertical movements common tion feeding mechanisms, are'transmitted 9 to the main feed-dog 21 and auxiliary feed-dog 22.

' 23 represents a feed-eccentric formed integral with afeed-eccentric frame 24 which is adjustably mounted, by pivot screw 25, steadying screw 26, adjusting screw 27, spring 28 and spring-abutting screw 29 to the belt-driving pulley 30 carried by the main shaft 5. The inner end of the adjustconnection encircles the eccentric 9, the lower to four-moing screw 27 coacts with the beveled end 31 of the feed-adjusting screw 32, through the manipulation of the adjusting nut 33, to determine the length of the stitch, a belt 34 struction and operation the same as in the acting to connect the pulley with the driven pulley 35 carried by the loop-takerdriving shaft 6.

All of the foregoing parts are in con- "38 secur'edby pinch-screw 39 upon the main feed rock-shaft 40. The forward end of the rock-shaft 40'is provided with lugs 41 and 42 to which is secured, by hinge pin 43, the feed-dog carrying bar 19. Thus it will be v seen that feed movements are transmitted from theeccentric 23 to the feed-.dog-carrying bar 19. I

44 represents an adjustably secured auxiliary feed-eccentric connection which is pivotallysecured at its upper end, by a nut-bolt 45, to the feed-eccentric connection 36, its opposite end being pivotally and adjustably attached, by a nut-bolt 46, to an arm 47 secured, by pinch-screw 48, upon a tubular feed rock-shaft 49 which is mountedto oscillate upon the feed rock-shaft 40. The forward end of the tubular feed rock-shaft 49 is provided with-lugs 50 and 51 to which there is. attached, by hinge pin 52, the feeddog-carrying bar 20; thus feed movements are transmitted to said bar from the feedeccentric connection 36, the adjustability of the nut-bolt 46 making it. possible to vary the extent of such feed movements, indeend'ently of the extent of movement of the eed-dog-carrying bar 19. a

From the foregoing it will be readily unf derstood that the feed-dog-carrying bar'19 isoperatively connected, through the rockshaft 40 and arm 38, with the main feed-eccentric connection 36' for effecting feed movements of the feed-dog 21 located at the i rear of the needle; that the feed-dogcarrying bar 20 is operatively connected, through the rock-shaft49 and arm 47 with the aux-- iliaryeccentric connection 44 for glvlng feed -movements to the feed-dog 22 located in front of the needle; that owing to the adjustment of the connection with the arm 47 the feed-dog 22 can he given feed movements of the saine or of greater amplitude than the -feed-dog 21; that owingto the feed-dogs being given their feedmovements from a single eccentric, thelr. amplitude'pf feed movements can be proportionately1n-v creased or diminished by a single adjust ment; and that the mounting of the two fee'd rock-shafts upon a like axis and the feed lift rock-shaft upon the hook or loop-takerdriving shaft makes it practical to; ,operat e' the feed-dogs without interfering wrththe manual manlpulatlonof the cop or bobbin.

Claims 1. In a feeding mechanism for sewing machines, a loop-taker-actuating shaft,"a needle-baractuating shaft provided withla feed-eccentric and a feed-lift eccentric, a

plurality of feed-dogs separately mounted and independently controlled in their, am-

plitude of feed movements, a plurality of feed rock-shafts having oscillating vmovements upon the same axis, a feed-lift rockshaft mounted upon the same axis as said.

loop-taker-actuating shaft, and -connec"tions for connecting said eccentrics .with said rock-shafts.

2. In a' feeding mechamsm for sewing machines, a needle-bar-actuating shaft prof vided with an adjustably-mounted eccentric, a tubular feed rock-shaft mounted in suitable bearings located beneath the bed-p1ate of the sewing machine and having pivotally connected to it a feed-dog-carrying bar provided with a feed-dog, a feed, rock-shaft mounted in said tubular rock-shaft and having pivotally connected to it a second feeddog-carrying bar provided with a feed-dog, connections for connecting the rock-shaft mounted in said-tubular rock-shaft with said eccentric including an arm carried b the latter rock-shaft, and a connection d'-.

rectly connected with said adjustably-- 3. In a feeding mechanism for sewing machines, a needle-bar-actuating shaft provided with an adjustably-mounted eccentric, a tubular feed rock-shaft mounted onsuitable bearings located beneath the bed-plate of the sewing machine and having pivotally connected to it a feed-dog-carrying bar provided with a feed-dog, a feed rock-shaft mounted in said tubular rock-shaft and having pivotally connected to it a second feed dog-carrying bar provided with a feed-dog, connections for connecting the rock-shaft mounted in said tubular rock-shaft with said eccentric including an arm carried by the latter rock-shaft, and a connection directly connected with said adjustably ounted ec-' centric, said tubular rock-shaft eing actuated through a-connection located bodily below said I needle-bar-actuating shaftfand upper end plvoted to the bonnet?- tion directly connected with said adjustingshaft for giving to said'feed dogs theiI' iO ably-mounted 'eccentric,the opposite end of vertical movements.' v n the connection located bodily below said nee- In testimony whereof, I have signed my dle-bar actuating shaft being adjustably name to this specification, in the presence connected-With said tubulanrock-shaft for oftwo subscribing Witnesses. I Y

changing the amplitude of feed movement JOHNS. FINQH. of one of said feed-dogs independently of- Witnesses:

' the other, and means including a feed-lift CARLYLE W TI iOMLS ccentric;oarried by said' needle-bar-actnat- ABBIE M. DoN1HEE. 

